import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'

Vue.use(VueRouter)

const routes = [
  {path:'/',redirect:'/login'},
  {path:'/login',component:Login},
  {
    path:'/home',
    component:Home,
    redirect:'/welcome',
    children:[
      {path:'/welcome',component:Welcome},
      {path:'/users',component:Users},
    ]}
]

const router = new VueRouter({
  routes
})

//挂载路由导航守卫
router.beforeEach((to,from,next)=>{
 // to将要访问的路径
  //from代表从哪个路径跳转而来
  //next是一个函数表示放行  next()放行  next('/login') 强制跳转
  if(to.path === '/login') return next();
  //获取token
  const tokenStr = window.sessionStorage.getItem('token');
  if(!tokenStr) return next('/login');
  next();
})

export default router
